Soils and fertilizers . Tube {or uAlhdraiulnq/ soil. Coarse aand Fig. 27. — Apparatus prepared for the demonstration of the presence ofcarbon dioxide in soil air. 154 SOILS AND FERTILIZERS First pull atmospheric air into the limewater for five results. Now connect flask to tube extending into the soil anddraw in soil air. What conclusions do you come to regarding therelative carbon dioxide content of soil air and atmospheric air ?What is the function of carbon dioxide in the soil ? Exercise III.

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